Much of his speech focused on Eastwood addressing an "invisible Obama" sitting in a chair beside him. Within minutes of his speech, @InvisibleObama was created on Twitter and it immediately gained thousands of followers.

Within the hour, #eastwooding became a Twitter trend, with people taking pictures of themselves arguing with empty chairs.

But in the Forum, Eastwood's "back and forth" with Invisible Obama got some of the loudest cheers, and the actor left the stage just as entered it: with a standing ovation.